The Accessibility Project is relatively new, but already has a ton of great resources – everything from tutorials on how to hide content but still make it accessible to screen readers, to a handy checklist you can use to make sure you've covered the accessibility basics before you launch.

There's also a great collection of links to accessibility resources, tools and tutorials around the web.

The Accessibility Project is very much a community effort, with all of the source code and posts on the site hosted on GitHub. If you'd like to contribute, head on over and read through the contribution guidelines before you fork the project.